THE POSTERWB LIMBS. 93 



posterior or cotyloid angle is prismatic and very voluminous. It exhibits : 

 1, Behind, a wide concave articular facet, which forms part of the cotyloid 

 cavity ; 2, Above this cavity, the supracotyloid crust, represented in 

 Man by the ischiatie spine. This is an eminence elongated from before to 

 behind, sharp on its summit, smooth inwardly, roughened outwardly, and 

 continuous by its anterior extremity with the internal border of the bone ; 



3, Outwardly, two deep imprints for the insertion of the rectus muscle; 



4, In front and inwards, the ilio-pectinecd eminence, a small elongated pro- 

 ininence forming the most salient point of a kind of ridge (linea ilio-pectinea) 

 that insensibly subsides above on the inner face of the ilium, and is continued 

 below by the anterior border of the pubis. 



Of the three angles of the ilium, the first is also termed the angle of the 

 haunch, and the second the angle of the croup. 



Pdbis. — Situated>4)etween the ilium and ischium, elongated from side to 



Fiof. 59. 



PELVIS; FRONT VIEW. 



1, Crest and anterior spinous process of the ilmm ; 2, Angle of the croup, with the 

 auricular facets proceeding from it ;, 3, Shaft of the ilium, with the ilio-pectineal 

 crest i 4, Cotyloid cavity ; 5, Symphysis pubis ; 6, Ischiatie tuberosity. 



side, flattened above and below, and irregularly triangular, the pubis, the 

 smallest of the three divisions, is divided for convenience of description into 

 two faces, three borders, and three angles. 



Faces. — The superior, smooth and concave, concurs in forming the floor 

 of the pelvis. It shows one or two nutrient foramina. The inferior _ is 

 roughened, and marked throughout its length by a wide channel which 

 reaches the bottom of the cotyloid cavity. This fissure lodges the pubio- 

 femoral ligament and a very large vein. , . i_ . 



Borders. — The anterior is constituted by a thin rugged lip, which is 

 curved upwards. The posterior, thick and concave, circumscribes anteriorly 

 a wide opening, the oval, subpubic, or obturator foramen ; it is channeled near 

 the cotyloid angle by a fissure which runs obliquely inwards and down- 

 wards. The internal is united with that of the opposite pubis to form the 

 p^bic portion of the pelvic symphysis. 



